CN100348521C - Technique for conveying and filtering red mud - Google Patents
Technique for conveying and filtering red mud Download PDFInfo
- Publication number
- CN100348521C CN100348521C CNB2005102003965A CN200510200396A CN100348521C CN 100348521 C CN100348521 C CN 100348521C CN B2005102003965 A CNB2005102003965 A CN B2005102003965A CN 200510200396 A CN200510200396 A CN 200510200396A CN 100348521 C CN100348521 C CN 100348521C
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- China
- Prior art keywords
- red mud
- red
- sedimentation
- carried
- dump
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Classifications
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F7/00—Compounds of aluminium
- C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
- C01F7/04—Preparation of alkali metal aluminates; Aluminium oxide or hydroxide therefrom
- C01F7/06—Preparation of alkali metal aluminates; Aluminium oxide or hydroxide therefrom by treating aluminous minerals or waste-like raw materials with alkali hydroxide, e.g. leaching of bauxite according to the Bayer process
- C01F7/066—Treatment of the separated residue
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
Abstract
The present invention discloses novel transportation and filtration technology for red mud for alumina production. Red mud slurry flowing from the bottom of a last time washing sedimentation tank of a sedimentation workshop is transported into a red mud slurry tank of a red mud stacking field by a cascade stage centrifugal pump and a pipeline. Partial hot water is added into the red mud slurry, the red mud slurry is pumped into a red mud pressure filter to be pressed and filtered, and obtained filtering cake is transported to each discharge point of the red mud stacking field by an automobile. Red mud is stacked and stored by a dry method. Red mud washing water which is obtained by pressing and filtration is returned to the sedimentation workshop of an alumina plant to be used for the sedimentation and the washing of the red mud. The advantages of the wet method transportation and the dry method stacking and storage of the red mud are comprehensively used by the present invention. The present invention has the advantages of low investment and the high utilization rate of the red mud stacking field, and is favorable for environmental protection.
Description
Technical field:
The present invention relates to a kind of process for making alumina, the red mud that particularly relates to a kind of alumina producer is carried and filtration process.
Background technology:
Red mud for alumina plant conveying at present, the scheme of storing up mainly contain three kinds, and relative merits are respectively arranged, and its As-Is analysis is as follows:
The red mud wet method is carried, wet method is stored up scheme: this is that present alumina producer uses maximum schemes.Red mud is after the subsider washing, deliver to the filtering red mud operation and carry out washing and filtering again with drumfilter, send the red mud slurry vessel then to, red mud liquid-solid ratio L/S index is adjusted to about 3～4, arrive red mud dump with impeller pump and pipe-line transportation again, its feature be red mud liquid-solid ratio L/S height, transporting resistance little, can adopt many tandem impeller pumps to carry, because impeller pump belongs to stdn standard machinery equipment, so invest lower.The shortcoming of this scheme is that water-content height in the red mud, red mud slip volume are big, and the red mud dump volume that takies is big, and water has taken sizable volume in the red mud dump, makes the stockyard utilization ratio lower, and the investment of red mud dump is bigger; In addition, such red mud dump antiseepage is handled difficult, and is unfavorable to environment protection.
Dry-method red mud is carried, dry method is stored up scheme: this scheme is that scheme is stored up in the advanced red mud conveying that China's alumina producer used over past ten years.Red mud is after the subsider washing, deliver to the filtering red mud operation and carry out washing and filtering again with drumfilter, send the red mud reactive tank to reduce viscosity then by stirring to shear, increase its flowability, and in reactive tank, red mud slurry is adjusted to 0.85～1.0 scope than L/S admittedly, deliver to red mud dump with high-pressure diaphragm pump and pipeline.Red mud adopts dry method to store up many advantages: the first, and water-content is little in the red mud, and volume is little, and the red mud dump volume that occupies is little, makes the utilization ratio height of red mud dump.The second, moisture hardly in the red mud dump, it is highly beneficial that red mud dump is prevented blending environment protection.The 3rd, can be used for building the red mud dam behind the red mud airing, save material of construction, so the working cost of red mud dump is lower.The 4th, because ponding not substantially in the red mud dump so the internal pressure that the red mud dam body is subjected to is little, helps the red mud body to aerial development, take up an area of also minimizing.The shortcoming of this scheme is after red mud slurry reduces than L/S admittedly, the viscosity of red mud slurry is bigger, the resistance of ducting is big during conveying, usually require red mud pump delivery pressure in the production at 12.0～16.0MPa, Ordinary Centrifugal Pumps can not meet the demands, must adopt the high-pressure diaphragm pump of import, this pump price up to 5,000,000 yuan/more than the platform.Supporting two the such pumps of the alumina producer of a 400kt/a scale, the investment of buying pump just needs more than 1,000 ten thousand yuan.
Automobile is carried, dry method is stored up scheme: this scheme is generally used for small scale aluminum oxide factory.Small scale aluminum oxide factory is because red mud amount is little, and red mud is carried the cooperation unit that can entrust in addition, thereby reduces the one-time investment expense of work.But for large-scale alumina producer, just there are a lot of shortcomings in this carrying method: the first, and labour intensity height, level of automation are low, entrucking and unloading all than trouble.The second, the working cost height, except that terminal charges, transport charge, highway cost is also higher.The 3rd, if the automobile transportation is untimely, may cause disadvantageous effect to production.
After above three kinds of red muds scheme of carrying, store up studied in great detail, the present invention is directed to the deficiency of present scheme, propose a kind of new red mud and carry, store up scheme.
Summary of the invention:
The objective of the invention is to: propose a kind of red mud and carry and filter novel process, the advantage that comprehensive utilization red mud wet method is carried, dry method is stored up is accomplished reduced investment, red mud dump utilization ratio height, is helped environment protection, to solve the problem that prior art exists.
The present invention is achieved in that red mud adopts the mode that wet method is carried, dry method is stored up, promptly from the next red mud slip of sedimentation workshop last washing settling groove underflow, be sent to tandem impeller pump and pipeline carry out suitable dilution in the red mud slurry vessel of red mud dump after, advance to carry out press filtration in the red mud filter press with pumping again, the red mud wash water that press filtration obtains returns alumina producer sedimentation operation and carries out the red-mud settlement washing, and the filter cake that press filtration obtains is had bad luck each discharge point of red mud dump with automobile.
From the red mud slip that sedimentation workshop last washing settling groove underflow comes out, its liquid-solid ratio is controlled at 1.5～2.5, adds hot water in the red mud slurry vessel red mud is diluted, and red mud adopts the moisture after pressure filter filters to be lower than 30%.
Main contents of the present invention are as follows:
(1), red mud adopts wet method to carry, but the red mud liquid-solid ratio is controlled at 1.5～2.5, comes out from existing last washing settling groove underflow, without the filtering red mud operation, directly send red mud dump.
(2), build the filtering red mud operation of alumina producer in red mud dump next door, the stockyard is provided with several red mud slurry vessels, and the red mud slurry that the sedimentation workshop is sent here enters in the red mud slurry vessel.
(3), filtering red mud adopts pressure filter, make filtering red mud after moisture be lower than 30%.
(4), redly after the press filtration have bad luck in the stockyard with automobile.
At present, no matter the underflow of alumina producer last washing settling groove adopts the still dark awl high rate settling of flat subsider, and the liquid-solid L/S of its underflow is than all reaching 1.5～2.5.According to the alumina producing experience, the slip impeller pump of this concentration is fine conveying, replaces high-pressure diaphragm pump with impeller pump, and its investment can reduce significantly.At red mud dump the red mud slurry vessel is set, purpose has been the buffer storage effect, guarantees that the filter feed is stable.
Move filtering red mud to red mud dump in alumina producer, with the drumfilter of pressure filter substituting import one, investment does not have big change.But the filter cake moisture content that pressure filter obtains is lower, usually below 30%.And the moisture content that existing alumina producer dry method is transported in the red mud slip of red mud dump is 46～48%, so this programme red mud moisture is lower, and this utilization ratio, red mud dump antiseepage, more favourable to environment protection to red mud dump.
Because it is big that red mud dump takes up an area of usually, for ease of storing up, red mud transports to respectively with automobile and stacks a little after the press filtration.The only operation in the red mud dump scope of these automobiles, shipment distance is short, mainly is the task of having bad luck, and does not exist to increase highway transport volume and hand over the toll problem.
The invention has the beneficial effects as follows: the advantage that comprehensive utilization red mud wet method is carried, dry method is stored up, helps environment protection at reduced investment, red mud dump utilization ratio height.
Description of drawings:
Fig. 1 schematic flow sheet of the present invention.
Embodiment:
Embodiments of the invention 1:
From the next red mud slip of sedimentation workshop last washing settling groove underflow, its liquid-solid ratio is controlled at 1.5～2.5, be sent to tandem impeller pump and pipeline in the red mud slurry vessel of red mud dump, after this adding part hot water dilutes, advance to carry out press filtration in the red mud filter press with pumping again, the red mud wash water that obtains after the press filtration returns alumina producer sedimentation operation and carries out the red-mud settlement washing, and the filter cake moisture that obtains is lower than 30%, has bad luck each discharge point of red mud dump with automobile.
Embodiments of the invention 2:
From the next red mud slip of sedimentation workshop last washing settling groove underflow, if the red mud slurry temperature is on the low side, can cause the viscosity increase and influence strainability, can in the red mud slurry vessel, set up vapour pipe, the red mud slip is heated temperature raising and is controlled at 80～90 ℃, guarantee the strainability that the red mud slip is good.Other are then identical with embodiment 1.
Claims (4)
1. a red mud is carried and filtration process, it is characterized in that: red mud adopts the mode that wet method is carried, dry method is stored up, promptly from the next red mud slip of sedimentation workshop last washing settling groove underflow, be sent to tandem impeller pump and pipeline carry out suitable dilution in the red mud slurry vessel of red mud dump after, advance press filtration in the red mud filter press with pumping again, the red mud wash water that press filtration obtains returns alumina producer sedimentation operation and carries out the red-mud settlement washing, and the filter cake that press filtration obtains is transported to each discharge point of red mud dump.
2. red mud according to claim 1 is carried and filtration process, and it is characterized in that: from the red mud slip that sedimentation workshop last washing settling groove underflow comes out, its liquid-solid ratio is controlled at 1.5～2.5.
3. red mud according to claim 1 is carried and filtration process, it is characterized in that: add hot water in the red mud slurry vessel red mud is diluted.
4. red mud according to claim 1 is carried and filtration process, it is characterized in that: red mud adopts the moisture after pressure filter filters to be lower than 30%.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005102003965A CN100348521C (en) | 2005-07-18 | 2005-07-18 | Technique for conveying and filtering red mud |
| PCT/CN2006/001740 WO2007009374A1 (en) | 2005-07-18 | 2006-07-18 | Technique for conveying and filtering red mud |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005102003965A CN100348521C (en) | 2005-07-18 | 2005-07-18 | Technique for conveying and filtering red mud |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1730416A CN1730416A (en) | 2006-02-08 |
| CN100348521C true CN100348521C (en) | 2007-11-14 |
Family
ID=35962844
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005102003965A Expired - Fee Related CN100348521C (en) | 2005-07-18 | 2005-07-18 | Technique for conveying and filtering red mud |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN100348521C (en) |
| WO (1) | WO2007009374A1 (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101602526B (en) * | 2008-06-11 | 2012-08-08 | 贵阳铝镁设计研究院有限公司 | Equipment and method for processing red mud in alumina factory |
| CN101870545A (en) * | 2010-06-10 | 2010-10-27 | 中国铝业股份有限公司 | Method for treating filter cakes of leaf filter |
| CN103086584A (en) * | 2013-02-25 | 2013-05-08 | 周海波 | Sludge treatment system and method |
| CN103172248A (en) * | 2013-04-17 | 2013-06-26 | 河南中美铝业有限公司 | Dry transporting and dry stockpiling method of Bayer red mud |
| CN105481218A (en) * | 2014-09-16 | 2016-04-13 | 沈阳铝镁设计研究院有限公司 | Red mud dry stockpiling method |
| CN105565349B (en) * | 2016-01-19 | 2017-05-17 | 中国铝业股份有限公司 | Recycling method for leaf filter residues in aluminum oxide production |
| CN107963797A (en) * | 2016-10-19 | 2018-04-27 | 北京华德创业环保设备有限公司 | A kind of concentrated phase red mud pipe carrying method |
| CN111807667A (en) * | 2020-07-30 | 2020-10-23 | 淮安港淮建设发展有限公司 | Harmless and environment-friendly sludge treatment system and process |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4250032A (en) * | 1978-07-31 | 1981-02-10 | Eurallumina S.P.A. | Process for the disposal of bauxite processing wastes and their containment into filling basins |
| US6033579A (en) * | 1994-10-14 | 2000-03-07 | Andritz-Patentverwaltungs-Gesellschaft M.B.H | Red mud dewatering and washing process |
| CN1413929A (en) * | 2002-12-06 | 2003-04-30 | 中国铝业股份有限公司 | Technology of sludge treatment of alumina waste water treatment system |
| CN1583533A (en) * | 2004-05-27 | 2005-02-23 | 张明玲 | Red mud transporting method in pipeline |
| CN1631784A (en) * | 2004-12-28 | 2005-06-29 | 中国铝业股份有限公司 | Red mud conveying method |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2027683C1 (en) * | 1992-10-29 | 1995-01-27 | Санкт-Петербургский государственный горный институт им.Г.В.Плеханова (технический университет) | Red sludge reprocessing method |
| US5607598A (en) * | 1995-07-14 | 1997-03-04 | Ormet Corporation | Treatment and disposal of red mud generated in the Bayer Process |
| CN100343172C (en) * | 2005-07-07 | 2007-10-17 | 贵阳铝镁设计研究院 | Tech. for filtering and transporting of red mud |
-
2005
- 2005-07-18 CN CNB2005102003965A patent/CN100348521C/en not_active Expired - Fee Related
-
2006
- 2006-07-18 WO PCT/CN2006/001740 patent/WO2007009374A1/en active Application Filing
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4250032A (en) * | 1978-07-31 | 1981-02-10 | Eurallumina S.P.A. | Process for the disposal of bauxite processing wastes and their containment into filling basins |
| US6033579A (en) * | 1994-10-14 | 2000-03-07 | Andritz-Patentverwaltungs-Gesellschaft M.B.H | Red mud dewatering and washing process |
| CN1413929A (en) * | 2002-12-06 | 2003-04-30 | 中国铝业股份有限公司 | Technology of sludge treatment of alumina waste water treatment system |
| CN1583533A (en) * | 2004-05-27 | 2005-02-23 | 张明玲 | Red mud transporting method in pipeline |
| CN1631784A (en) * | 2004-12-28 | 2005-06-29 | 中国铝业股份有限公司 | Red mud conveying method |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2007009374A1 (en) | 2007-01-25 |
| CN1730416A (en) | 2006-02-08 |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: GUIYANG ALUMINUM AND MAGNESIUM DESIGN INSTITUTE CO Free format text: FORMER NAME: GUIYANG ALUMINIUM AND MAGNESIUM DESIGN INST. |
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| CP03 | Change of name, title or address |
Address after: 550081 Guiyang Province, Jinyang New District, Zhu Zhu Road, No. 2 Patentee after: Guiyang Aluminum & Magnesium Design Institute Co., Ltd. Address before: 550004 No. 208, Beijing Road, Guiyang, Guizhou Patentee before: Guiyang Aluminium and Magnesium Design Inst. |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20071114 Termination date: 20150718 |
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| EXPY | Termination of patent right or utility model |